Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
hanh ca » hanh cac, hanh cat, hanh cua
va hanh » van hanh, va thanh, va danh
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
ly nang » ky nang, ly hang, ly vang
toc va » hoc va, toc ta, tuc va
ca cua » co cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ly nang ((le hoi) OR (ma hoa)). hieu va cac toc va hanh ca cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ly nang ((le hoi) or (ma hoa)). hieu va cac toc va hanh ca cua tre*.